Revision 0:346c8150ca74, committed 2014-09-06

Comitter:

wernert

Date:

Sat Sep 06 09:30:35 2014 +0000

Child:

1:c0cfd1b0f4ef

Commit message:

This mBuino project demonstrates a low power LED flasher for mBuino that uses deep sleep to achieve low current consumption. It only flashes one LED at a time for 10 mS long every 1 second. The idea is for keyring flasher that works for long time.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WakeUp.h	Sat Sep 06 09:30:35 2014 +0000
@@ -0,0 +1,98 @@
+#include "mbed.h"
+
+/**
+ * Class to make wake up a microcontroller from deepsleep using a low-power timer. 
+ *
+ * @code
+ * // Depending on the LED connections either the LED is off the 2 seconds
+ * // the target spends in deepsleep(), and on for the other second. Or it is inverted 
+ * 
+ * #include "mbed.h"
+ * #include "WakeUp.h"
+ * 
+ * DigitalOut myled(LED1);
+ * 
+ * int main() {
+ *     wait(5);
+ *
+ *     //The low-power oscillator can be quite inaccurate on some targets
+ *     //this function calibrates it against the main clock
+ *     WakeUp::calibrate();
+ *    
+ *     while(1) {
+ *         //Set LED to zero
+ *         myled = 0;
+ *         
+ *         //Set wakeup time for 2 seconds
+ *         WakeUp::set_ms(2000);
+ *         
+ *         //Enter deepsleep, the program won't go beyond this point until it is woken up
+ *         deepsleep();
+ *         
+ *         //Set LED for 1 second to one
+ *         myled = 1;
+ *         wait(1);
+ *     }
+ * }
+ * @endcode
+ */
+class WakeUp
+{
+public:
+    /**
+    * Set the timeout
+    *
+    * @param s required time in seconds
+    */
+    static void set(uint32_t s) {
+        set_ms(1000 * s);
+    }
+    
+    /**
+    * Set the timeout
+    *
+    * @param ms required time in milliseconds
+    */
+    static void set_ms(uint32_t ms);
+    
+    /**
+    * Attach a function to be called after timeout
+    *
+    * This is optional, if you just want to wake up you 
+    * do not need to attach a function.
+    *
+    * Important: Many targets will run the wake-up routine
+    * at reduced clock speed, afterwards clock speed is restored.
+    * This means that clock speed dependent functions, such as printf
+    * might end up distorted.
+    *
+    * Also supports normal way to attach member functions
+    * (not documented for simplicity)
+    *
+    * @param *function function to call
+    */
+    static void attach(void (*function)(void)) {
+        callback.attach(function);
+    }
+
+    template<typename T>
+    static void attach(T *object, void (T::*member)(void)) {
+        callback.attach(object, member);
+    }
+    
+    /**
+    * Calibrate the timer
+    *
+    * Some of the low-power timers have very bad accuracy.
+    * This function calibrates it against the main timer.
+    *
+    * Warning: Blocks for 100ms!
+    */
+    static void calibrate(void);
+
+
+private:
+    static FunctionPointer callback;
+    static void irq_handler(void);
+    static float cycles_per_ms;
+};
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WakeUp.lib	Sat Sep 06 09:30:35 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/Sissors/code/WakeUp/#b2a710aca356

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Sep 06 09:30:35 2014 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+#include "WakeUp.h"
+
+DigitalOut LED[] = {(P0_7), (P0_8), (P0_2), (P0_20), (P1_19), (P0_17), (P0_23)};// declare 7 LEDs
+
+void myDeepSleep() {
+    LPC_PMU->PCON = 0x1;
+    SCB->SCR |= SCB_SCR_SLEEPDEEP_Msk;
+    LPC_SYSCON->PDAWAKECFG &= 0xFFFFF800;
+    __WFI();
+}
+
+int main() {
+
+    int i = 0;
+    
+    //The low-power oscillator can be quite inaccurate on some targets
+    //this function calibrates it against the main clock
+    WakeUp::calibrate();
+    while(1)
+    {  
+        LED[i] = 1; // turn on
+        wait(.01);   // delay
+        LED[i] = 0; // turn off
+        
+         //Set wakeup time for second
+        WakeUp::set_ms(1000);
+        //Enter deepsleep, the program won't go beyond this point until it is woken up
+        myDeepSleep();
+        i++;
+        if (i >= 7) 
+           i = 0;             
+    }
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Sat Sep 06 09:30:35 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/9327015d4013
\ No newline at end of file